Hvac Blower Motor Starts Then Stops

If you can dismount the blower, then go buy a new one. Final Stage Resistor from ac or heater. Regardless of thermostat settings (Cool, Off, Heat, Fan, Auto, Temp) the blower motor stops turning within a few minutes of starting up. One blower functions to cool the motor during its operation and is usually made from plastic and is visible when you open the furnace door. How to test the pressure switch. Both of these issues result in reduced voltage reaching the furnace and lack of power to the motor. I did some searching and found no answer so here goes. AC Motor 3-Phase Soft Starters from AutomationDirect, the best value in industrial automation - low prices, fast shipping, and free award-winning service. Some 1995 and 1996 thru the first half of 1997 vehicles came with a electric servo-motor flap control system with a recirculation button for the fresh air flap and a button for the A/C. Close the car hood and test the blower motor if it's working properly. The Central Air Conditioner Unit Is Running Constantly. The components in your Jeep receive stable electrical power thanks to the fuses that regulate them. This n ew technology has an ECM motor with a speed controller. After shutting off the cooling, I wanted to see why it froze over. Now I see only two relays for the auxiliary heat elements and a blower motor with no capacitor. After about 2 minutes the fan stops and then no air comes out of the vents. Power then flows to the blower motor. HVAC Blower Motor Resistor AC Blower Control Module for 2010-2017 Ford Expedition 2010-2014 Ford F-150 2011-2017 Lincoln Navigator with Auto Temp Control Replace # BL3Z-19E624-A YH-1829 4. If the furnace draws air from outside the home, check for an obstructions at the air inlet. The blower motor resistor, also commonly referred to as an A/C blower motor resistor or a heater blower motor resistor, is an important component to your vehicle’s heating, ventilation, air conditioning (HVAC) system. start and run the indoor blower motor. Another Blower motor problem, works fine, then hit a bump, doesn't If it works, then I hit a bump, it stops. If the flame is proved, a timer is started to delay the start of the circulating fan for 30 to 40 seconds. If I turn the ignition very quickly (0. The motor was oiled and that didn't help either. The relay is normally open and should always have power from the circuit breaker. It will come on heat pump only at first, then the aux heat. Why would a motor overheat so quickly? 2. for about 6 seconds and is also timed from the time that the sail switch closes. Re: blower fan works for a whilethen quits?? Updated 7:05pm Eastern on 8/7/07 While this is not a good fix you might have someone that does electrical work rig up a power cord to the blower motor (If the motor is good) and plug it in. Sometimes cycling the AC control to Off and then back to MAX will make it start working. all start by loosing. only sold online, part houses don't list this item in a search. A blown out fuse impedes the operation of the blower motor and the fan. The ac started going off and on. turn the power off the the furnace and reach in there and see if the wheel is secured tightly to the motor shaft. Now I see only two relays for the auxiliary heat elements and a blower motor with no capacitor. Another Blower motor problem, works fine, then hit a bump, doesn't If it works, then I hit a bump, it stops. All the while the furnace is still running, after about 20 seconds or so, the blower starts again and continues running as normal. Re: Furnace blower comes on before ignition Ok, thanks for the replies. Yesterday I parked the car facing the sun in Grand Rapids, MI for about 4 1/2 hrs. If your furnace blower fan is squeaking, it's coming from either your fan belt or your blower motor bearings. 3) Make sure the blower motor panel is shut. The blower will start once warmed up and the ice that was causing it to not operate properly melts away. What does it mean if your furnace is making a weird noise? The job of an HVAC technician would be so much easier if furnaces could talk, not because it would give us someone to chat with while we work on repairs, but because a talking furnace could simply tell homeowners when something was wrong. furnace repair parts furnace blower parts furnace blower furnace blower motor replacement furnace repair hvac repair parts furnace blower repair furnace blower motor nordyne replacement parts furnace parts mobile home repair parts gas furnace repair parts heil furnace. Look for a Reset button near the blower motor’s housing and, if you find one, press it. No matter how many times (or position) the fan speed knob is moved, the front blower motor fails to respond. 1) the problem occurs regardless of any settings. Eventually the hi temp sensor will kick in and turn the gas off. That's where Repair Clinic comes in. Motor and/or blower needs lubrication. Then I changed the blower motor. Re: blower fan works for a whilethen quits?? Updated 7:05pm Eastern on 8/7/07 While this is not a good fix you might have someone that does electrical work rig up a power cord to the blower motor (If the motor is good) and plug it in. Blower motor loses level 5 at 20,000 and then total failure at 40,000. This covers T4R model years 2003-2007. Furnace Starts Then Stops York Furnace Draft Inducer Motor Replacement Part S1 32642583000. 5 % of CFM). If you can dismount the blower, then go buy a new one. Check to make sure the furnace filter is clean. Replace the motor. Is it a switch?. On high it starts out blowing full speed but slows down and eventually stops after about 5 minutes. The blower motor resistor is located right at the blower motor under the passenger side dash board. Blower won't stop running : 1. Not sure how to check either. Air Conditioner Blower Motor Prices and Replacement Procedure. It would start and run normally for a few minutes and then the blower would shut off. NEW by: charlie jones I replace a heat strip in a old janitors ac united and I started the united up and the fan ran but out door united would not run in cool, but when I jump the wire across the terminal of the 24 volt wire that run to the out side united the blower moter stop and the out door united run and freeze up a litter bit until I take the jumper. Leaves or other debris past the blower stops at the evaporator core and can restrict airflow. It starts fine in morning coming out of my garage but after being parked outside in the sun it shuts down shortly after starting the car. Is it a switch?. Start capacitors are designed for momentary use. I did some searching and found no answer so here goes. There are latches on each connector. Could the new module and blower be faulty. i felt that was a lie and they either didn't. if your blower is working but keeps cutting out then there are more chances of a faulty blower. Check the furnace flame for a complete blue color. A capacitor is a device that stores an electrical charge. I turned the thermostats Heat Switch Off & the Cool Switch Off and turned the fan Switch from AUTO to ON & the blower motor did the same thing, blower runs for about 20 seconds then stops for 3 seconds then runs for about 20 seconds. Air conditioner starts then stops after only a few seconds Then it does it again What could be wrong? If the air conditioner stops working, it could be low on freon or the motor could have seized. So make sure you securely shut furnace blower panel. Below is a list of some common issues to look for when troubleshooting a unit. The draft inducer motor starts running and the ignitor begins heating up, slowly becoming a bright orange color. Replace the motor. If your problem is revolving around the indoor blower motor (Motor that delivers airflow to the home) and NOT the inducer draft motorwhich from your question, I believe does then, the following three items are the only problems that would cause the issue described. It has an SF-25 furnace. just acts like it isn't even on. It has a three wire connector from the AC control head going into it and the two wires that connect to the blower motor coming out of it. Your furnace may also give you fault codes related to draft inducer blowers. Just wanted to share my experience with the intermittent running blower. (Follow the manufacturer’s procedures). Gas furnace starts then stops? This video provides information on how to troubleshoot a furnace and the most likely defective parts associated with this problem. 00), and it took me 10 minutes to take out the old blower motor and put the new one in (check out the Youtube video called "2007 Toyota Tundra DIY. An Inducer motor is a small single phase motor located inside the gas furnace of your heating system. Reset limit switch for stop-start cycling. chrysler forum at Car Dealer Forums; Hi I'm re-posting this query because I think you guys in the USA may not. If the blower motor is working at normal speed, replacing it with another that does the same, would make no difference. It's located inside the dash, often on the opposite side of the steering wheel or inside the engine compartment on the firewall. What Go-Parts Guarantees You: Lifetime Warranty Guaranteed. But you’ll still need to change to AUTO to save money and prevent repairs. One cause for this sound is that the blower wheel came loose from the motor shaft, moved and is hitting the blower housing. Verify the run capacitor for the proper rating. How to wire capacitor start ac motor [closed] and my neutral together and then orange, black, and hot together. Why my furnace starts, then stops, keeps on doing this till the thermostate clicks, then it works,starts over? the furnace heats the home, then instead of tuning off, the fan starts for about 10 seconds, off for 2 or 3, then starts, stops, starts stops. Limit switch set wrong. Before you attempt to fix a furnace that won't start, make sure you know what kind of furnace you have. On high it starts out blowing full speed but slows down and eventually stops after about 5 minutes. An AC motor is an electric motor driven by an alternating current (AC). If the blower stops with either of these steps, the problem is in the HVAC control module. Not sure how to check either. Greetings all! I have a 2014 Corolla LE that appears to have a HVAC blower motor resistor failing. Long story short - it was the blower fan regulator. You don't need to know what a blower motor is to check that it is working properly. It might work fine for a while then all of a sudden stop a couple days then start back. Then when I stop at a light it continues to work fine till I accelerate away then it starts blowing Hot. Since the blower is already spinning, the motor can start without a start capacitor. a blower motor and a combustion motor. This is how I replaced the HVAV blower motor resistor in a 2005 Tacoma. The blower will start once warmed up and the ice that was causing it to not operate properly melts away. Regardless of thermostat settings (Cool, Off, Heat, Fan, Auto, Temp) the blower motor stops turning within a few minutes of starting up. Sometimes you can verify a bad blower motor with a rap from a screw driver handle on the bottom of the blower motor when it's not operating but the ignition key and blower switch are 'ON'. It continues to run even after the normal cycle and even when I turn the thermostat to the off position. If you are getting voltage, then this could be the blower motor itself. every once in a while it will work correctly for a few hrs then starts on and off. acts like blower motor to me. Start capacitors possess a very large capacitance value for their size and voltage rating, and as a result, are only intended for intermittent duty. If there is voltage (120 volts) and the motor is not running, then it will be a defective motor. If not, replace the dirty filter with a clean filter. 6L is working intermittently. 1) the problem occurs regardless of any settings. In fact, it's responsible for a whopping 90% of all furnace problems! Simply change the filter and then if the unit has a reset button, marked "RESET" near the motor housing, wait 30 minutes to let the motor cool, then turn the power off to the furnace and. It has a three wire connector from the AC control head going into it and the two wires that connect to the blower motor coming out of it. Just wanted to share my experience with the intermittent running blower. This is always helpful to pinpoint the problem to the inducer motor in the first place. Step 6: Connect the negative cable to the battery again. I was about 10 seconds from replacing my blower motor resistor before I had one last weak attempt to avoid the cost. My blower motor stopped, then I would wiggle the wire under the. Hi Everyone: My blower fan has stopped working. Therefore, it’s essential to keep it in good condition if you want your air conditioner to work. The inside fan will come on after about a minute, run for 30 seconds then shut off. If your furnace runs for a few minutes and then stops, it can be really annoying and get really cold. One of the first symptoms of a bad or failing AC blower motor relay is a blown AC blower motor relay. The furnace draws air from the surrounding area or from outside the room. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Sometimes is sounds like the compressor tries to come on and cannot and then clicks off. If the furnace fires, the blower should come on within a few minutes. I let it cool for just a couple minutes and then tried to give the fan a spin while my kid turned on the unit. Call light is still on on the side. Turn off your A/C, remove the INSIDE shroud. The heater/ac blower does not come on. One blower functions to cool the motor during its operation and is usually made from plastic and is visible when you open the furnace door. The contact owns a 2009 Dodge Ram 1500. Same result. I think its the blower motor , My heat runs hot then slows down. The possible central air conditioning problems could be: The ac filter, evaporator, condenser coil is dirty. If the furnace is located in a utility closet or in a cramped storage room, there may not be sufficient available air for the furnace to heat properly. I hooked up a volt meter to the AC blower fan at the point where the power wires connect to the fan. To confirm the condition of the fuse, you have to take a look at it. i felt that was a lie and they either didn't. And I thought "While I am in there anywhere". Step 5: Check Your Blower Motor if Your Furnace Still Won’t Turn On. For future reference, don't buy a cheap off brand replacement unit, it may be defective. • Do not operate the motor without blower wheel attached. RV Furnace Stops Running Overnight. The blower motor resistor is located right at the blower motor under the passenger side dash board. Start by checking for power with a test light at the blower motor fuse (key on). When you try to turn on the heat or ac the blower comes on intermittently. If you are getting voltage, then this could be the blower motor itself. Im having Problems with my blower motor, Sometimes it will work and sometimes it wont. The outside unit is turning on and the fan inside starts to push the air through the vents. Audi A4 B7/B8: How to Replace Heat/AC Blower Motor. Trace the wire from the blower motor to find the switches, open the switch box cover and look for two metal strips that have a raised contact button about the size of 1/2 of a pencil eraser end. FYI: *You would be surprised how many people go without heat or cooling for hours/days and all the problem they have is the switch on the side of the furnace is not turned on or the blower door is loose after they change a filter!. Check to make sure the furnace filter is clean. TO SEE A COMPLETE PARTS NOMENCLATURE FROM THE MANUFACTURER OF THE PARTS FOUND ABOVE CLICK HERE Lau blower parts nomenclature. The inside fan will come on after about a minute, run for 30 seconds then shut off. Dodge AC Blower Motor. Carrier claims it is a true VS motor, but why is the fan curve then not flat?. Furnace Blower Motor. Then checked the plug going into the blower motor, and saw that it was not burnt and looked just fine. Blower motor problems can cause many driver complaints. Clean or replace filter. Question: Blower motor will not run on high have replaced motor and resistor. • Do not operate the motor without blower wheel attached. Console panel lit up, can hear doors open and close when pushing switches, AC kicks in when turned on/off. After waiting a minute, the fan would blow hard, then slow to a stop again. The outdoor AC compressor unit is constantly running but the indoor blower fan keeps stopping. Sometimes completely stops until you restart the car, then same thing. The motor itself will have only 2 wires. I've even found dead mice in blower motors that have caused this issue. If nothing happens, wait about 30 minutes for the motor to cool, and then try the Reset button again. It continues to run even after the normal cycle and even when I turn the thermostat to the off position. Blower motors can go bad as well, though they usually won't work on start-up, rather than stop working while running. My furnace blower doesn't always start. In this case, if no damage was done to the wheel or the motor shaft, it could be moved back to the proper spot and re-tightened to the motor. i gave them price and they said they wanted to upgrade the whole system instead. If not, then you either have a blown fuse or a severed wire, or the blower relay is not working right. The unit is direct drive. More importantly, it could be the sign of a major HVAC problem that requires repair. It starts fine in morning coming out of my garage but after being parked outside in the sun it shuts down shortly after starting the car. A start capacitor is typically found on an air conditioning unit or heat pump where extra torque is needed to start the compressor. After checking the breakers, thermostat and overflow shut off (did not have one) I saw something about a blower motor capacitor. I have a 2005 TR4 and for the last two weeks my AC will stop blowing air for a day or so and then it start working again. There should not be any voltage to the motor until it starts. If the furnace draws air from outside the home, check for an obstructions at the air inlet. temperature-starts and stops the blower motor when the temperature is correct if the voltage is being read then that is the amount the. I did some searching and found no answer so here goes. In fact, it's responsible for a whopping 90% of all furnace problems! Simply change the filter and then if the unit has a reset button, marked "RESET" near the motor housing, wait 30 minutes to let the motor cool, then turn the power off to the furnace and. Start for maybe half an hour and then stops again for several hours. The 2006 Chevrolet Silverado has 18 problems reported for blower fan stops working sometimes. What does it mean if your furnace is making a weird noise? The job of an HVAC technician would be so much easier if furnaces could talk, not because it would give us someone to chat with while we work on repairs, but because a talking furnace could simply tell homeowners when something was wrong. You don't need to know what a blower motor is to check that it is working properly. I have a Coleman 7966-856 Furnace and when the furnace calls for heat it fires up. If I turn the car off with the fan blowing/working, it will work when I start it up again, about 1/2 the time. If you replace — — the blower control module go to step 26. In hot environments, this capacitor may be over worked and fail prematurely. my outside condenser starts and stops. Comments: I'm reading your article HVAC Blower Fan and Regulator Replacement, and was wondering if this is related to my problem. Look for a Reset button near the blower motor's housing and, if you find one, press it. If the furnace is located in a utility closet or in a cramped storage room, there may not be sufficient available air for the furnace to heat properly. One Room Is Warmer Than The Other. If your circuit breaker is not tripped, then the problem is likely to be either your thermostat itself or your blower motor (fan) has completely failed and consideration should be made to calling in an HVAC technician or replacing the thermostat with a new one (I’d start with a new thermostat because it is the cheaper option, so don’t let. Re: Furnace blower comes on before ignition Ok, thanks for the replies. In the meantime, it will go into lockout mode. If you have cool air but a steady airflow, your blower motor is working but your heat exchanger or burner is not. Goodman CKJ48-1AB Thought that AC wasnt cooling 100%, and low and behold went outside and condenser fan was not turning and fan was hot as well as entire unit. com for best pricing. 5 seonds and stops, then starts DC Motor only runs. If it is hard to spin, then the motor has failed. My 4450 ac blower motor worked fine all day yesterday until the last 2 hours and then it shut off. A typical RV air conditioner will have both a compressor motor starting capacitor and blower motor run capacitor, since they are generally of the Capacitor Start Induction Run (CSIR) type. Blower motor stops working. The back EMF is constant while the compressor is running. It might work fine for a while then all of a sudden stop a couple days then start back. As you examine your furnace system, watch for two potential culprits: Leaks in oil lines and soot in the burner chamber. When the fan slows down and stops, it could. Finding the location of the fan assembly is a good place to start. All the while the furnace is still running, after about 20 seconds or so, the blower starts again and continues running as normal. You should take the blower motor out and inspect it and at least change the resistor pack for it. Relay clicks to start blower in 30 seconds after burner started, but blower doesn't start or stops and then. Thanks for your question about your 05 Focus. I have experienced this with a Q7 fan blower. All the while the furnace is still running, after about 20 seconds or so, the blower starts again and continues running as normal. Goodman CKJ48-1AB Thought that AC wasnt cooling 100%, and low and behold went outside and condenser fan was not turning and fan was hot as well as entire unit. The blower motor powers the fan inside the furnace, which blows the cool or hot air from the furnace into your home. So I walked into the basement and heard a nice humming sound and noticed a nice burning smell (no smoke). The first thing I would do is to. I have removed the motor from the machine in order to fit a replacement but have some questions about the existing motor before I splash out on a new one 1. So if the button won't reset, or quickly pops up again, it's time to call a professional repair service. A/C Fan Motor Replace. When the fan is not working properly, you won’t feel air coming out of your vents, and the air conditioner coils will end up freezing over. An air conditioning compressor is the heart of the the unit and can be a real problem if not working. For some reason, mice like the insulation in the HVAC system. Can hear AC compressor kick on, but just no blower fan. Start capacitors stay energized long enough to rapidly bring the motor to 3/4 of full speed and are then taken out of the circuit. Genteq Motors 6203E - Evergreen EM ECM Replacement Blower Motor, 1/3 HP (230V) - Universal Genteq Evergreen X13 blower motor that is designed to replace ALL X13 Motors that are 1/3 HP and 208-230 Volt. Eventually the hi temp sensor will kick in and turn the gas off. If you have a decent motor shop nearby you could pull the whole blower assembly and have them put in another motor & wire it up for you (as long as it has a plug-in connector). Could the new module and blower be faulty. This is when the tstat calls for heat. I can turn the motor off at the motor and/ or if I take the fuse out the furnace shuts off. Blower Motor Components If the blower motor in your vehicle isn't working, you may find yourself very uncomfortable behind the wheel and ready to replace some components. Sometimes cycling the AC control to Off and then back to MAX will make it start working. This is how I replaced the HVAV blower motor resistor in a 2005 Tacoma. Then, the blower motor seems to try to run every 10 minutes or so. Repair the connector. Both of these issues result in reduced voltage reaching the furnace and lack of power to the motor. It would run non-stop but you would have some AC until the heat wave tames and you can get things fixed up. If the pressure switch is closed, where power can pass through, the IFC will stop the process and try again. Automotive Blower Motor. The vehicle was taken to an independent mechanic where it was diagnosed that hvac blower door and motor hvac head unit need to be removed and replaced. Hi i have a suberan nt40 furnace that i have replaced the fan blower motor for noise and also replaced blower time delay relay and temp switch and sail switch, my problem is the furnace comes on and lites the burner and works fine for about 4 minutes and then the blower starts going slower and finally stops and burner is still lit, and it will. As the relay is the switch that supplies current to the blower motor, if it fails internally, then power will be cut off from the blower motor circuit, causing the motor to no longer function or blow any air from the vents. Did cold weather cause my Jeep's heater fan to stop blowing and then start again later? No blower, no heat, no front defrost, nothing. It sounds like the blower is blowing full speed but the volume is super low even though it is still blowing cold. GMC Sierra No High Speed Fan. Starts and stops itself. It has an SF-25 furnace. The fix is the same no matter what the cause. If you have power and ground going in and nothing coming out when you have selected max blower on the control panel, then you have a failed AC blower control module. I let it thaw out over night and it still has the same issue this morning. the switch position doesnt seem to affect it either. The vehicle was taken to an independent mechanic where it was diagnosed that hvac blower door and motor hvac head unit need to be removed and replaced. Long story short - it was the blower fan regulator. However, if the blower continues to run at high speed with either of those tests, replace the blower motor control processor. AC light & recirc light still light up and AC compressor clutch engages when turning fan on in AC mode, but not getting the fan to work. The outside unit still continues to run but the blower motor stops. When the fan is not working properly, you won’t feel air coming out of your vents, and the air conditioner coils will end up freezing over. I'm having a problem with my Broan Electric furnace lately. So I walked into the basement and heard a nice humming sound and noticed a nice burning smell (no smoke). BMW Blower Motor Inoperative, No Air Flow, Diagnosing - Motor vs. My central AC unit decided to stop on the hottest day of the year. Step 6: Connect the negative cable to the battery again. It has a three wire connector from the AC control head going into it and the two wires that connect to the blower motor coming out of it. Go to page number indicated in Index for CLEANUP AND STARTUP INSTRUCTIONS. The motor that runs the fan in the heating and air conditioning system in a car is called a blower motor. A faulty blower motor can leave you freezing or sweating, quite literally. In hot environments, this capacitor may be over worked and fail prematurely. theres two motors in your furnace. Many owners are having problems with melted electrical connectors that stop the flow of power to the blower motor. At first this is intermittent, then later pretty much constant. It worked for a few days, then the blower motor stopped working again. Sometimes completely stops until you restart the car, then same thing. Find the broken belt. The fix is the same no matter what the cause. Only when power from the thermostat is present does the relay close after a 20 second delay. If your furnace runs for a few minutes and then stops, it can be really annoying and get really cold. I also tried heat with similar results. i felt that was a lie and they either didn't. If so, turn off the power from the unit, unplug the blower motor wires, ( Note where they go) then remove the two screws holding the blower motor housing and the housing should slide out, then you. Every part comes with a limited lifetime warranty. The transformer is a small box inside the furnace that has wire connections on both sides. I have replaced the starter capacitor with no avail. The blower motor is new and it does work. If I turn the car off with the fan blowing/working, it will work when I start it up again, about 1/2 the time. If the call for heat continues uninterrupted, after a further 8 minutes, the blower switches to a higher. If I turn the ignition very quickly (0. Voltages and ground are. Blower was making noise then stopped working. It would start and run normally for a few minutes and then the blower would shut off. Hello all, I have a 2006 Tacoma and very recently all the blower motor speeds stopped working. the switch position doesnt seem to affect it either. Now the blower motor works. A capacitor is a device that stores an electrical charge. • Blower runs for 15-30 seconds then burner will fire up. My wife just recently began experiencing an issue with her 2011 Jeep Grand Cherokee Laredo. At times it runs fine but starts the same issue. If it is hard to spin, then the motor has failed. If the furnace is located in a utility closet or in a cramped storage room, there may not be sufficient available air for the furnace to heat properly. I am used to seeing at least a fan relay or fan control card and an external capacitor for the PCS blower motor. Blower motors can go bad as well, though they usually won't work on start-up, rather than stop working while running. Greetings all! I have a 2014 Corolla LE that appears to have a HVAC blower motor resistor failing. I suspect a timing problem, but the furnace guy said it is "normal". AC light & recirc light still light up and AC compressor clutch engages when turning fan on in AC mode, but not getting the fan to work. The blower motor does not start and the furnace shuts back down. After we help you figure out why your furnace blower starts then stops, we'll show you how to fix it. furnace repair parts furnace blower parts furnace blower furnace blower motor replacement furnace repair hvac repair parts furnace blower repair furnace blower motor nordyne replacement parts furnace parts mobile home repair parts gas furnace repair parts heil furnace. ProTech: Probably a bad blower motor resistor you have there, or possibly a faulty blower motor or switch. The outdoor AC compressor unit is constantly running but the indoor blower fan keeps stopping. What would cause the. Start capacitors possess a very large capacitance value for their size and voltage rating, and as a result, are only intended for intermittent duty. But you’ll still need to change to AUTO to save money and prevent repairs. Auto Zone checks them for free. Relay clicks to start blower in 30 seconds after burner started, but blower doesn't start or stops and then. What would cause the.